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{4b422a53-5e7a-4d97-99eb-c01c5d49b9d6}w.sys

Okiitan

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {4b422a53-5e7a-4d97-99eb-c01c5d49b9d6}w.sys by Okiitan has been detected as adware by 10 anti-malware scanners. It runs as a Windows kernel mode device driver named “{4b422a53-5e7a-4d97-99eb-c01c5d49b9d6}w”. It will plug into the web browser and display context-based advertisements by overwriting existing ads or by inserting new ones on various web pages.
Publisher:
StdLib  (signed by Okiitan)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
82fd9c218679bf4148fca82e7f50c8d5

SHA-1:
5ba1913c65f786d05a26b6720faa0cd113eeab1b

SHA-256:
cd811e76d788a9299448cbcbc841512a4cc37fea62bfc47b07c40a274284dbca

Scanner detections:
10 / 68

Status:
Adware

Explanation:
Injects advertising in the web browser in various formats.

Analysis date:
4/26/2024 4:02:14 AM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
RiskWare.NetFilter
7.1.1

AhnLab V3 Security
PUP/Win32.BrowseFox
2014.09.24

Avira AntiVirus
Adware/BrowseFox.A.168
7.11.173.240

AVG
Generic
2015.0.3342

Comodo Security
Application.Win32.RiskWare.NetFilter.D
19597

Dr.Web
hacktool program Tool.NetFilter.1
9.0.1.05190

herdProtect (fuzzy)
variant of {7afe3a9e-a637-49a8-9084-bf73405b41b6}w.sys (Adware)
2014.12.5.18

NANO AntiVirus
Riskware.Win32.Yotoon.dfewso
0.28.2.62286

Reason Heuristics
PUP.Okiitan.k
14.9.23.14

VIPRE Antivirus
Threat.4741131
33120

File size:
38.2 KB (39,096 bytes)

Product version:
1.4.3.1

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win32 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{4b422a53-5e7a-4d97-99eb-c01c5d49b9d6}w.sys

Digital Signature
Signed by:
Okiitan

Authority:
VeriSign, Inc.

Valid from:
2/3/2014 4:00:00 PM

Valid to:
2/4/2015 3:59:59 PM

Subject:
CN=Okiitan, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Okiitan, L=Santa Monica, S=California, C=US

Issuer:
CN=VeriSign Class 3 Code Signing 2010 CA, OU=Terms of use at https://www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

Serial number:
72D4F4A7BAF3F88B2B0D2403A4F6CFDB

File PE Metadata
Compilation timestamp:
9/12/2014 4:32:59 PM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:jf5OQ5p9MZq9Vkh5z8tZfJm/6D1GqA+5+TFpEwX21tZe:jf5H5pH+x8t1c/+Gd+5/4mg

Entry address:
0x903E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, 20, 80, FF, FF, CC, CC, 74, 91, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, AE, 94, 00, 00, C0, 70, 00, 00, B4, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 04, 95, 00, 00, 00, 70, 00, 00, EC, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A0, 98, 00, 00, 38, 70, 00, 00, C4, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 98, 99, 00, 00, 10, 70, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, DC, 94, 00, 00, F0, 94, 00, 00, C8, 94...
 
[+]

Entropy:
6.6599

Code size:
24.5 KB (25,088 bytes)

Driver
Display name:
{4b422a53-5e7a-4d97-99eb-c01c5d49b9d6}w

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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